Republican presidential front-runner Donald Trump said Wednesday that if he's elected president he would send back Syrian refugees taken in by the U.S. because they may be Islamic State of Iraq and Syria (ISIS) militants in disguise. "I'm putting the people on notice that are coming here from Syria as part of this mass migration," Trump said during an evening rally in Keene, N.H.. "If I win, they're going back." The billionaire businessman, who is leading early opinion polls, said during an hour-long speech — which included several profanities — that he was worried the refugees, who have been fleeing their country after years of civil war, could be ISIS militants looking to get into the U.S.

'This could be one
of the great tactical ploys of all time. A 200,000-man army, maybe. That could
be possible.'- Donald Trump, Republican
canadidate

"They could be ISIS, I don't know," said Trump, who questioned both the
number of men in their ranks and why Syrians were fleeing their country instead
of staying and fighting.

"This could be one of the great tactical ploys of all time. A 200,000-man
army, maybe," he later added. "That could be possible."

Millions of Syrians, many risking their lives in crowded boats and rafts, have been fleeing a civil war that has killed more than 250,000 people since March 2011. As many as nine million people have been displaced, including more than four million who have fled the country, according to the United Nations.

Secretary of State John Kerry announced earlier this month that the U.S.
would significantly increase the number of migrants it takes in over the next
two years, with 85,000 refugees from around the world allowed in next year and
up to 100,000 in 2017.

That's less than some have urged, but as many, he said, as the U.S. can
handle given post-Sept. 11 screening requirements and a lack of resources. Other
countries, such as Germany, are accepting far more.

Trump is not the first lawmaker to raise alarms about the potential of ISIS
and other terrorist organizations using the refugee crisis to try to enter the
United States or Europe. Some intelligence officials and Republican lawmakers
have expressed similar concerns.

Trump also repeated his support Wednesday for Russia's military involvement
in Syria, the same day that Russia launched airstrikes that U.S. Defense
Secretary Ash Carter said appeared to have targeted
areas that did not include ISIS militants.

Trump said President Barack Obama "looked like the JV" in his dealings with
Russian President Vladimir Putin during the United Nations General Assembly this
week.

In a break from his typical campaign events, Trump spoke at length about the
tax
policy proposal he unveiled earlier this week and said he planned to release
another, on veterans' issues, in two weeks.

But he also took his typical political shots at rivals Marco Rubio and former
Florida Gov. Jeb Bush, who was holding his own event about an hour away.

"Jeb Bush is down the road. They're expecting 125 people tonight," Trump
taunted. His crowd numbered in the thousand.

'We have an
obligation to make sure that people coming here are legitimate, but send them
all back? To a hellhole?'- Republican
candidate Jeb Bush

Across the state in Bedford, Bush took questions in front of a crowd of 250 —
the second time he's held a dueling event in the state with Trump. Bush never
mentioned Trump by name during his speech, but said a candidate won't win by
lecturing people and calling them stupid, a word Trump uses frequently on the
trail.

Later, asked by reporters about Trump's comments on Syrian refugees, Bush
said Trump should show "some sensitivity" to something that is a "serious
challenge."

"We have an obligation to make sure that people coming here are legitimate,
but send them all back? To a hellhole?" he said. "This is the same guy, by the
way, that's also advocating what seems to be support of Putin and his emergence
in Syria."